fix: update changesets "fixed" group for the trigger-* rename

The Release workflow's fixed-group verifier requires the group to match
the public workspace exactly; swap the renamed trigger package names.

Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>

Author: os-zhuang

.changeset/config.json

@@ -43,8 +43,8 @@
       "@objectstack/plugin-security",
       "@objectstack/plugin-sharing",
       "@objectstack/plugin-webhooks",
-      "@objectstack/plugin-trigger-record-change",
-      "@objectstack/plugin-trigger-schedule",
+      "@objectstack/trigger-record-change",
+      "@objectstack/trigger-schedule",
       "@objectstack/connector-mcp",
       "@objectstack/connector-rest",
       "@objectstack/connector-slack",